Karem Aircraft has been confirmed as one of four competitors selected for the initial preliminary design phase of the Defense Advanced Research Projects Agency’s (Darpa) Vertical Take-Off and Landing (VTOL) X-Plane program. VTOL X-Plane aims to demonstrate a vertical-lift aircraft that can cruise at 300-400 kt., but achieve a 75% hover efficiency and a cruise lift-to-drag ratio (L/D) of at least 10, as well as carry a useful load of at least 40% of the vehicle’s gross weight. ...


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